Room ventilator

Abstract

A ventilator intended for placing in an outer wall has a double-acting axial-flow fan with an inner and an outer impeller blade ring disposed such that the blade rings are each in register with a coaxial channel in a duct placed in a through-opening in the wall. A reversing means is connected to the impeller motor for changing the direction of rotation thereof so that it alternatingly rotates in one or the other direction. A regenerator means is inserted in the channels, the means both absorbing heat and distributing moisture within itself.

What I claim is: 
     
       1. Ventilator adapted to be located in a wall for providing air exchange through the wall, said ventilator including: (a) a double-acting, controllable, axial-flow fan means having an impeller with an inner blade ring and an outer impeller blade ring, the blades in said two rings being set to transport air in mutually different directions through said blade rings during rotation of said impeller;   (b) a coaxial duct having an inner channel in communication with said inner blade ring of said impeller, and an outer channel in communication with said outer impeller blade ring of said impeller;   (c) reversing means, connected to said fan means, for controlling said fan means to reverse the direction of said impeller so that said impeller alternately rotates in one or the other direction; and   (d) regenerating means, located in both said inner channel and said outer channel for alternately absorbing and emitting heat, and absorbing and desorbing moisture;   (e) said ducts and said blade rings being mutually dimensioned such that the air flow provided in one of said ducts in one direction when the impeller is rotating in a first direction is essentially the same as the air flow provided in the other of said ducts in the same direction when said impeller is rotating in the opposite direction.   
     
     
       2. Ventilator as claimed in claim 1, characterized in that one impeller blade ring of said impeller has the blades arranged in a right-hand helix and the impeller blades of said other impeller blade ring arranged in a left-hand helix, and in that the blades in said two rings have streamlined blade profiles including rounded portions, said rounded portions of the blades in both rings facing in the same direction. 
     
     
       3. Ventilator as claimed in claim 1, characterized in that a means for separating from each other the openings for supply and exhaust of air to the two channels is placed at least on one side of the wall. 
     
     
       4. Ventilator as claimed in claim 3, characterized in that an air stream separating means including a first cupformed section which is placed over the inner channel and has a first duct extending along the wall, and also including a second section which is annular and extends over the outer channel and is separated from the inner section and has a second duct extending along the wall in the opposite direction to the first duct is placed at least on one side of said wall. 
     
     
       5. Ventilator as claimed in claim 1, characterized in that a temperature probe is placed in each of said two channels, and in that said probes are connected to said reversing means so as to control reversing of said impeller in accordance with the difference in temperature in said two channels sensed by said probes. 
     
     
       6. Ventilator as claimed in claim 1, characterized in that a heating coil is connected close to the inlet or outlet for air to each of said two channels on the side of the wall facing towards a room which is to be ventilated. 
     
     
       7. Ventilator as claimed in claim 1, characterized in that said reversing means includes a circuit for providing, at each reversal, interruption of the voltage supply to the fan motor for a predetermined time period. 
     
     
       8. Ventilator as claimed in claim 1 wherein the cross-sectional areas of said two ducts are substantially the same. 
     
     
       9. Ventilator as claimed in claim 2 wherein said rounded portions face towards the outside of the wall. 
     
     
       10. Ventilator as claimed in claim 7 further comprising means for varying said predetermined time period.